Posted at 06:27h
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Most of the times, the client asks for upgrade or the companies purpose for Joomla upgrade if the site is hacked very often and/or is found to be infected with malicious code.
The most common mistake the developers make is to take the backup of current website and process the upgrade steps at the same. This process does upgrade the necessary extensions or core files, however, the malicious code files saved in the Joomla core folder(s) remain as it is and hence the site is again hacked.